Japanese version Home Page Updated on July 18, 2001
July 16, 2001
MisV cross identifications
MISAO Project Announce Mail (July 16, 2001)
Hello. I am Seiichi Yoshida working on the MISAO project.
The number of new variable stars discovered in the course of the MISAO Project reached to 1119 on May 30. But most of them have observations at only a several nights, so their type is uncertain.
There may be some valuable objects among them, like novae or some cataclysmic variables. In order to confirm that, we have to look up past images like the DSS (Digitized Sky Survey). But it takes some time to do it for all new variable stars.
We have been referring to two star catalogs, the GSC 1.1 and the USNO-A2.0, and an infrared catalog, the IRAS Point Source Catalogue, and picking up counterpart data of every MisV star. If there is data in those catalogs, we can say the star is not a nova or cataclysmic variable.
However, many MisV stars are not recorded in any of those catalogs, probably because the MISAO Project new variable stars are very faint in common. So we could not select small number of remarkable candidates of novae or cataclysmic variables among many new variable stars.
Recently, many new star catalogs and infrared catalogs are released. Then John Greaves, the United Kingdom, and Seiichi Yoshida researched those new catalogs to find the counterpart of every MisV star.
We worked on the following catalogs.
The recent new catalogs contain many faint stars. Especially, most of the red variable stars, Mira-type or semi-regular type, which appears very bright on CCD images, are recorded in the 2MASS catalog.
After this research, only 27 objects among 1119 are selected, which has no counterpart data in any catalogs.
John Greaves and Seiichi Yoshida checked the past images for the rest 27 stars using the following web services, and revealed they are not novae or cataclysmic variables.
USNO Flagstaff Station Integrated Image and Catalogue Archive Service
The identification results of this research are merged in the MisV catalog available at the MISAO Project home page.
In the IBVS 5135 issued on July 9:
The 76th Name-List of Variable Stars
the permanent designations are assigned to 179 MisV new variable stars. For example, MisV0001 should be called V4652 Sgr, MisV0002 should be called V523 Aur after this. These GCVS designations are also merged in the MisV catalog available at the MISAO Project home page.
-- Seiichi Yoshida email@example.com http://www.aerith.net/